High pressure induced insulator-to-semimetal transition through intersite charge in NaMn7O12

Davide Delmonte, Francesco Mezzadri, Fabio Orlandi, Gianluca Calestani, Yehezkel Amiel, Edmondo Gilioli

Research output: Contribution to journalArticlepeer-review


The pressure-dependent behaviour of NaMn7O12 (up to 40 GPa) is studied and discussed by means of single-crystal X-ray diffraction and resistance measurements carried out on powdered samples. A transition from thermally activated transport mechanism to semimetal takes place above 18 GPa, accompanied by a change in the compressibility of the system. On the other hand, the crystallographic determinations rule out a symmetry change to be at the origin of the transition, despite all the structural parameters pointing to a symmetrizing effect of pressure. Bond valence sum calculations indicate a charge transfer from the octahedrally coordinated manganese ions to the square planar ones, likely favouring the delocalization of the carriers.

Original languageEnglish
Article number81
Issue number2
StatePublished - 3 Feb 2018


  • Charge ordering
  • High pressure
  • MIT
  • Strongly correlated systems


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